Dipterocarpus retusus

Dipterocarpus retusus, commonly known as hollong,^[3] is a large tree and perhaps the best known species in the genus Dipterocarpus. It is native to China, Vietnam, Philippines, Laos, Cambodia, Malaysia, Indonesia, Myanmar, and India.^[1][4] The tree, some 20–30 metres (70–100 ft) tall, is found in Cambodia in dense forests of the plains, common on hillsides and along rivers and in forests between 800 m (2,600 ft) and 1,500 m (5,000 ft) altitude.^[4]

In Vietnam

Dipterocarpus retusus
from Koehler's Medicinal-Plants (1887)
Conservation status
Endangered  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Malvales
Family:	Dipterocarpaceae
Genus:	Dipterocarpus
Species:	D. retusus
Binomial name
Dipterocarpus retusus Blume[2]
Synonyms[2]
Dipterocarpus macrocarpus Vesque Dipterocarpus mannii King ex Kanjal, P.C.Kanjal & D.Das Dipterocarpus pubescens Koord. & Valeton Dipterocarpus spanoghei Blume Dipterocarpus tonkinensis A.Chev. Dipterocarpus trinervis Blume

Sapling at Hoollongapar Gibbon Sanctuary, Assam

Hollong is the state tree of Assam and Arunachal Pradesh, India.^[5] In India, the timber is used for plywood and making various containers. In China, the timber is used in construction.^[1] Hollong is a sacred tree for Moran community of Assam.^{[citation needed]}

Uses

It is farmed for its timber and resin. In Cambodia, the resin is collected by people in the mountainous regions, in order to make torches and candles, while the wood is used in construction to make columns and boards.^[4]